A visit to the St Justus Cathedral (Cattedrale di San Giusto, or Duomo di Susa) is also a must if you visit Susa. Established in 1029 by the Marquese Olderico Manfredi to house the newly-discovered relics of St Justus, it is a Roman Catholic cathedral, seat of the Bishop of Susa.
Susa (Latin: Segusio) was founded by the Gauls. In the late 1st century BC it became voluntarily part of the Roman Empire. Remains of the Roman city have been found in the excavations of the central square, the Piazza Savoia. Susa was the capital of the province of Alpes Cottiae (Cottian Alps).
Susa is also the gateway to the Monceniso (Mont Cenis) mountain pass (Colle del Moncenisio), a favourite for road cyclists and motorcyclists. The Giro d’Italia and Tour de France have both used this mountain pass on race stages, the Tour featuring it 5 times. It has been classified hors-catégorie (yielding the highest number of points in the King-of-the-Mountains classification) since 1999 .